Basic missions are really easy, with a little knowledge of HTML, javascript, UNIX and SSI all of the missions can be easily cracked. Here are the links to all these solutions.
Basic 1: The Idiot Test
Basic 2: Common sense
Basic 3: Deep into HTML
Basic 4: Changing the scripts
Basic 6: Decrpyt an encryption
Basic 7: Unix
Basic 8: SSI
Basic 9: Not difficult but tricky
Basic 10: Javascript, really?
Basic 11: Is there a solution even?
Note: There is no link to mission 5, as I was too tired to write one for that level. For help regarding mission 5, read the tutorial of mission 4, after all they are pretty similar.
Good luck!!!